![]() ![]() Positronium can also form a cyanide and can form bonds with halogens or lithium. Molecules of positronium hydride (PsH) can be made. ![]() Molecular bonding was predicted for positronium. Corrections that involved higher orders were then calculated in a non-relativistic quantum electrodynamics. Also calculations using relativistic quantum electrodynamics are difficult to perform, so they had been done to only the first order. This had yielded lifetimes that were too long. Measurements were in error because of the lifetime measurement of unthermalised positronium, which was only produced at a small rate. There was a discrepancy known as the ortho-positronium lifetime puzzle that persisted for some time, but was eventually resolved with further calculations and measurements. ![]() Many subsequent experiments have precisely measured its properties and verified predictions of quantum electrodynamics. It was experimentally discovered by Martin Deutsch at MIT in 1951 and became known as positronium. Other sources incorrectly credit Carl Anderson as having predicted its existence in 1932 while at Caltech. Stjepan Mohorovičić predicted the existence of positronium in a 1934 article published in Astronomische Nachrichten, in which he called it the "electrum". The Positronium Beam at University College London, a lab used to study the properties of positronium. This natural decay rate of ortho-positronium is relatively slow (~140 ns decay lifetime), compared to the aforementioned pick-off process, which is why the three-gamma decay rarely occurs.
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